docs: def account_distance(A1, A2):
      """Return the distance between two accounts. Here that is just the
      difference in sum(alpha)
  
      Args:
          A1 (Account): The first account.
          A2 (Account): The second account
  
      Returns:
          float: The distance between the two accounts.
      """
      return (sum([action.alpha for action in A1]) -
              sum([action.alpha for action in A2]))